单项选择题

Which phase of the software development requires the most development time

A．the design phase
B．the testing phase
C．the maintenance phase
D．the development phase
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单项选择题
The Programming Counter(PC) is normally used to point out
A．The address of next execution instruction
B．The address of last execution instruction
C．The address of current execution instruction
D．Programmed execution instruction
单项选择题
计算机网络的三个主要组成部分是
A．若干数据库，一个通信子网，一组通信协议
B．若干主机，一个通信子网，大量终端
C．若干主机，电话网，一组通信协议
D．若干主机，一个通信子网，一组通信协议
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